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Income Per Common Share | 12 Months Ended
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Dec. 31, 2012
Income Per Common Share |
Income Per Common Share | 2. Income Per Common Share The following table sets forth basic and diluted net income per common share and the basic weighted average shares outstanding and diluted weighted average shares outstanding (in thousands, except per share data):
|  | Year ended December 31, |
--- | --- | --- | ---
|  | 2012 |  | 2011 |  | 2010 |
Net income |  | $ | 30,928 |  | $ | 127,987 |  | $ | 361,760 |
Income from continuing operations per common share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.80 |  | $ | 3.23 |  | $ | 9.16 |
Diluted |  | $ | 0.79 |  | $ | 3.11 |  | $ | 8.51 |
Basic weighted average shares outstanding |  |  | 38,477 |  |  | 39,658 |  |  | 39,499 |
Dilutive effect of stock options, restricted stock awards and units and convertible debt |  |  | 574 |  |  | 1,497 |  |  | 3,015 |
Diluted weighted average shares outstanding |  |  | 39,051 |  |  | 41,155 |  |  | 42,514 |
Basic income per common share is computed using the basic weighted average number of common shares outstanding during the period. Diluted income per common share is computed using the basic weighted average number of common shares and common equivalent shares outstanding during the period. Potentially dilutive securities attributable to outstanding stock options and restricted stock of approximately 1.3 million, 0.7 million and 0.3 million common equivalent shares during the years ended December 31, 2012, 2011 and 2010 were excluded from the calculation of diluted net income per share because their inclusion would have been anti-dilutive. During the second quarter of 2011 the entire outstanding principal balance of our convertible debt was converted, with the principal amount paid in cash and the conversion premium paid in shares. The convertible notes met the criteria for determining the effect of the assumed conversion using the treasury stock method of accounting, since we had settled the principal amount of the notes in cash. Using the treasury stock method, it was determined that the impact of the assumed conversion for the years ended December 31, 2011 and 2010 had a dilutive effect of 0.6 million shares and 1.2 million shares, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 + Details
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